Critical gaps across all dimensions. Tool definitions lack parameter descriptions, input schemas are not visible in source code, and descriptions are minimal or absent. The server registers 18 tools via tool_registration.py using fastmcp's @server.tool() decorator with output_schema=build_output_schema(func), but actual parameter schemas and descriptions are not shown in provided code. Without seeing the function signatures and docstrings in tools/*.py files, parameter validation cannot be assessed. Naming is reasonable (verb_noun pattern: build_app, install_app, click, swipe), but descriptions appear to be auto-generated or missing entirely. No evidence of error handling guidance, recovery paths, or actionable error messages. STDIO transport limits remote accessibility.

• Add comprehensive docstrings to every tool function in tools/*.py. Each docstring must include: (1) What the tool does, (2) When to use it vs. similar tools, (3) What it returns. Target 50 - 200 characters per description.
• Define input schemas explicitly for all 18 tools. Use JSON Schema with 'type', 'description', and 'enum'/'pattern'/'minimum'/'maximum' constraints for every parameter. Example: {'type': 'string', 'description': 'Device ID (e.g., emulator-5554)', 'pattern': '^[a-zA-Z0-9:-]+$'}.
• Add parameter descriptions to every input. For UI tools (click, swipe, drag), document coordinate ranges and units (e.g., 'x: integer, 0 - 1080 pixels'). For build tools, document valid app names and paths.
• Implement actionable error messages. Instead of 'Error: device not found', return 'Device not found. Available devices: [list]. Try list_devices() to see all connected devices.'
• Add confirmation/dry-run support for destructive operations (uninstall_app, build_app with overwrite). Return a confirmation token that must be passed in a follow-up call, or add a 'dry_run=true' parameter.

Inferred effective spec: 2025-06-18+.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry